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参数资料
| 型号： | ISL6557ACBZ |
| 厂商： | Intersil |
| 文件页数： | 16/18页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24-SOIC |
| 标准包装： | 600 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 75% |
| 电源电压： | 4.75 V ~ 5.25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 包装： | 管件 |
ISL6557A
Application on page 3). Figure 14 and Equation 26 are
provided to assist in the selecting the correct value for RT.
0.3
1000
0.2
100
0.1
I L,PP = 0
I L,PP = 0.5 I O
I L,PP = 0.75 I O
0
0
0.2
0.4
0.6
0.8
1.0
DUTY CYCLE ( V IN / V O )
10
10 100 1000
SWITCHING FREQUENCY (KHZ)
FIGURE 14. RT VS SWITCHING FREQUENCY
10000
FIGURE 15. NORMALIZED INPUT-CAPACITOR RMS
CURRENT VS DUTY CYCLE FOR 2-PHASE
CONVERTER
0.3
I L,PP = 0 I L,PP = 0.5 I O
RT = 10
[ 11.09 – 1.13 log ( f S ) ]
(EQ. 26)
I L,PP = 0.25 I O
I L,PP = 0.75 I O
Input Capacitor Selection
The input capacitors are responsible for sourcing the ac
component of the input current flowing into the upper
MOSFETs. Their rms current capacity must be sufficient to
handle the ac component of the current drawn by the upper
MOSFETs which is related to duty cycle and the number of
active phases.
Figures 15, 16 and 17 can be used to determine the input-
capacitor rms current as of duty cycle, maximum sustained
0.2
0.1
output current (I O ), and the ratio of the combined peak-to-
peak inductor current (I L,PP as defined in Equation 1) to the
maximum sustained load current, I O . Figure 18 is provided
as a reference to demonstrate the dramatic reductions in
input-capacitor rms current upon the implementation of the
multiphase topology.
16
0
0 0.2 0.4 0.6 0.8
DUTY CYCLE ( V IN / V O )
FIGURE 16. NORMALIZED INPUT-CAPACITOR RMS
CURRENT VS DUTY CYCLE FOR 3-PHASE
CONVERTER
1.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6557ACBZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 24-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6557CB | 制造商:Intersil Corporation 功能描述: |
| ISL6557CB-T | 制造商:Intersil Corporation 功能描述: |
| ISL6557CB-T WAF | 制造商:Intersil Corporation 功能描述: |
| ISL6558CB | 功能描述:DC/DC 开关控制器 Precision MultiPhase RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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